The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Bandwidth reservation in mobile wireless networks is a very challenging task due to the instability of radio channels, node mobility and lack of coordination between mobile nodes. Previously proposed reservation MAC protocols reserve a slot to each real-time source assuming that the source will use the reserved slot in each super-frame. Since different applications may have different bandwidth requirements,...
We propose a new framework called dynamic adaptive quality of service (DAQoS) to guarantee the quality of service (QoS) of multimedia traffic generally classified as Constant Bandwidth Service (CBS) and variable Bandwidth Service (VBS). DAQos implements a traffic-based admission control, bandwidth reallocation and reservation schemes to support multimedia traffics. The objectives that DAQoS framework...
On-demand broadcast is an efficient wireless data dissemination method for mobile services.As the rapid growth of the mobile application,there is an increasing need for system to support large data dissemination.This paper investigates wireless on-demand broadcast algorithms.We propose a new scheduling algorithm called FMT(Fluent Media Transfer) which takes the flux of program,the program size,request...
Telemedicine traffic transmission over wireless cellular networks has gained in importance during the last few years. Due to the fact that this type of traffic carries critical information regarding the patients' condition, it is vitally important that multimedia telemedicine traffic has highest transmission priority in comparison to all other types of traffic in the cellular network. However, the...
The current Internet servers are susceptible to network attacks. The DDoS attacks consume the network bandwidth and degrade the services provided by the servers. This paper proposed a mechanism to provide security and quality of service (QoS) for a server pool with the support at the edge router. It focuses on the protection of the services based on the priority of different traffic flows and the...
Peer-to-peer SIP (P2PSIP) based server farm is proposed to provide distributed solution of multimedia applications. In this paper, we focus on the bandwidth requirements of both DHT and SIP packets from the perspective of a single server node in P2PSIP based server farm to quantitatively evaluate the overhead caused by distributed architecture. Furthermore, the efficiency of server node is also studied...
Multicast service of multimedia data messages are attractive network application. In conventional TCP/IP computer network, all functions of group membership management, routing and bandwidth reservation are required to be supported by all intermediate routers and availability of the multicast service is not always enough for network users. The overlay multicast is an expected solution where only logical...
Many multicast video streaming algorithms have been proposed to provide scalable streaming media services, but they are designed for homogeneous clients, i.e., users are assumed to have the same receiving bandwidth. The performance of these state-of-the-art algorithms will degrade significantly in user heterogeneous environment. A scheme, called the enhanced patching, is proposed to support user heterogeneity...
This paper investigates the integration of an effective prediction scheme for bandwidth allocation in a GEO satellite architecture supporting DVB-RCS (Digital Video Broadcasting - Return Channel Satellite) features. The prediction strategy joined to a simple scheduling method implemented in the satellite terminals, allows a good QoS differentiation to the miscellaneous traffic categories.
In video-on-demand (VoD) systems, a number of sophisticated architectures have been proposed to provide instantaneous services through the use of unicast and multicast technologies. Most of the architectures adopt a delivery scheme independent of the popularity of the requested video and the current system load, which fails to achieve a better bandwidth utilization ratio. This paper presents a unified...
This paper proposes a novel Adaptive Time-Threshold-based bandwidth allocation Scheme for Multimedia calls (ATTSM) in cellular networks. In proposed scheme, multimedia services include voice and data calls and the bandwidth threshold for non-prioritized handoff multimedia calls and new multimedia calls can be varied adaptively based on handoff and new multimedia call arrival rates. This makes it possible...
The performance of a computer network is mostly affected by heavy traffic. The upcoming networks are more sensitive to time. Especially in multimedia networks, time is an important factor. So, efficient mechanisms are needed to improve the performance of the network. Connectionless network uses multiple paths to send the packets and achieves higher bandwidth. But, Connection-oriented network uses...
More and more streaming protocols are developed for the multimedia applications. However, many streaming protocols only consider the network stability, but not the characteristics of streaming applications. In order to cooperate with H.264/MPEG-4 AVC scalable extension which can achieve fine granularity of scalability at bit level to the time-vary heterogeneous networks, we design a TCP-friendly congestion...
Bandwidth reservation in wireless networks is a very challenging task due to the instability of radio channels, node mobility and lack of coordination between nodes. Reservation MAC protocols define a super-frame and allocate as lot to each real-time traffic source. However, the use of fixed length super-frame may result in bandwidth wasting, especially when heterogeneous classes of traffic with different...
We investigate in this paper congestion control algorithms that are TCP-friendly and media-friendly at the same time, so they are more suitable for multimedia streaming than TCP's AIMD. We use in this investigation the optimization framework developed by Kelly et al. in. Kelly et al. derived two gradient-like algorithms, a primal algorithm and a dual one, to control the congestion in a computer network...
The usage of multimedia applications such as IP-TV and Video On Demand over wireless networks becomes more and more popular. In many cases the bandwidth of the wireless channel is the system bottleneck and thus it is important to increase the ability of wireless networks to provide a scalable service for multiple users simultaneously. The main idea proposed in this paper is based on a dynamic bandwidth...
Multimedia streaming is resource demanding. It may starve other applications such as file transfer sharing the network, for example, in a smart home. To address the problem, we apply fuzzy logic control to bound the bandwidth consumption of multimedia streams. We also differentiate the video quality for streams with different levels of importance. We have implemented our transmission rate control...
The interaction between multicasting and real-time multimedia streams poses various new and interesting problems in research on communication protocols and architectures. For example, display systems of heterogeneous users in the same session may have different or even varying latency, display resolution, and/or processing capabilities. In this paper, we propose a receiver-oriented resource reservation...
Bandwidth adaptation (BA) mechanisms provide an effective solution for handling congestion in wireless multimedia networks. Several factors go into the design of a bandwidth adaptation mechanism. In this paper, we investigate some of these factors and study their effect on the performance of bandwidth adaptation mechanisms. A simple model was proposed to help us with our study. Simulation results...
Wireless mesh networks (WMNs) are promising last-mile access network with large coverage and low deployment and operational cost. As the realization of WMNs becomes attainable, business opportunities have focused a number of applications such as multimedia streaming. However, in the case of multiple clients streaming, intrinsic nature of wireless medium sharing property results severe streaming bandwidth...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.